Compressor.



J. STUMPF.

COMPRESSOR.

PPLITION FILED SEPT. 22, 1910.

Patented Mar. 4, 1913.

sraras raduni" aaron.

censuu struinen, or BERLIN, GERMANY.

COMPRESSOR.

Specication of Letters latent.

Patented Mar. et, 1913.

Application 'led September 22, 1910. Serial No. 583,183.

pressors, of which the following is a specication.

This invention relates to air compressors of the kind in which the airis compressed on one side of a piston and the steam presvsure acts on the other side, in other words to compressors in which the motive piston is also the pumping piston. In such combined plant the disadvantage is met that the working cylinder requires to be kept hot to avoid condensation lossesY in the steam and further the same cylinder requires to be kept cold to avoid excessive increase of temperature of the air during compression. These antagonistic requirements are met if the steam side of the piston works on the unidirectional principle.

According to this invention a combined compressor and reciprocating engine is composed of a unidirectional low single acting engine the piston of which acts also as the compressor piston. To enable this to take place the cylinder is closed'at both ends and the piston is made of such length and so disposed that it only uncovers the steam exhaust ports at one side.

The invention also comprises in combination with a single acting compressor as above, means for balancing the. pressures on the moving parts sothat a uniform driving orcemay be obtained.

The invention is illustrated in the accompanying drawing as applied to a compound tandem compressor.

'The drawing is a sectional elevation through such a compressor arranged in ac- 1 cordance with this invention.

Referring to the accompanying drawings steam enters the cylinder a past the 'valve d is cut oil and expands thereby propelling the piston to the right. When the piston b uncovers the exhaust ports e the expanded steam passes through thse ports into the annular chamber c arranged around the cylinder and form'in part of the condenser. Owin to the'fact at the temperature of the 'cy vinder walls is graded downward from A the.\hot inlet to the cold exhaust, no serious loss is encountered by arranging the cylinder `and condenser with a common wall.

Furthermore the cylinder is by this means evacuated to a very high degree and thereby the region around the exhaust is cooled to a very low temperature.

The piston b is of such length that on its return stroke it does not uncover the ports e but draws in air at atmospheric pressure past the valve f. There is this atmospheric pressure on one side of the piston Z and a vacuum on the other side. The air pressure thus If desired the cylinder Walls to the right o the annular chamber c may be water jacketed or they may be left uncleaded so as to be cooled by radiation.

The right hand end of the cylinder a is closed by a cover lf2 through which passes a rod 7c connecting the piston o with 'the is ton 7c of a high pressure compression cy inder z' arranged in tandem with the cylinder a. An automatic stuflng box k3 lserves to pack the rod 7c.

Air pressed out from the cylinder a passes the valve g into an intermediate cooler h assists the return stroke of the iston. 1

and is drawn from the cooler h through the pipe 'i2 into the chamber a" of the cylinder z'. The air enters past the valve h into the cylinder z', is compressed and expelled past the valves g into the high pressure conduits. The chamber z" communicates with the front end of the piston 7c.

It will be seen in the first place that the cooling of the low pressure compressor cylinder does not inter ere with the efficiency of the engine because 1n the irstplace the com-A pressor cylinder has no part ,of its walls common with the steam spacein the c linder and in the second place the part o the Working cylinder nearer the compressor is the cold end of the unidirectional iow steam engine. Then again owing to the at.- mospheric pressure acting on the piston b during the compression stroke in the en ine and owing to the piston being balance by the connection of'both its ends with the chamber z' during the same stroke, there is a uniform load on the parts and the high compression necessarily met with in this form of unidirectional llowsteaxn engine entirely compensates :for the atmospheric ressure acting on the compressor side o the piston o.

I claimz f l. In combination a cylinder having' a steam inlet port`at one end and exhaust ports intermediate its length, a long piston tioned cylinder, a. pieton in seid eompresscr cylinder, and a constanly open connection from the air discharge valve of the `iist mentioned cylinder to one side of the piston in said high pressure compressor,

2., En combinatien a c'ylinfie having a steam inlet? port at one end. and exhaust ports intermediate its length, a long pisnn in. said cylinder ei'mngef and pioportiened to uncover said exhaust ports ai one of its ends only at and neer he emi of its tevei lessees a condenser chambex arranged about seid exhaust ports anf into which seid ports open directly, air suction and discharge Valves at the opposite end of seid cylinder te the iniet ports, a high pressure compressor vcylinder arranged co-exielly with said irst mentioned cylinder, e, piston in said compressor cylinders and e constentiy open connection from the en" discharge valve ci the first mentioned ,cynder to one side of the piston in seid high pressure compressoit( In Witness whereof have hereunto .sei

my hand in the presence e-. iwi) witnesses@ JHNN l Witnesses i Hem/MEN 150mm; WOLFGANG Tnnuwew.

Gomes ef this gieten?, may be ehtene@ im: 

